2 # Implements GENI GID. GIDs are based on certificates, and the GID class is a
3 # descendant of the certificate class.
14 # Create a new uuid. Returns the UUID as a string.
17 return str(uuid.uuid4().int)
21 # (uuid, hrn, public_key)
23 # UUID is a unique identifier and is created by the python uuid module
24 # (or the utility function create_uuid() in gid.py).
26 # HRN is a human readable name. It is a dotted form similar to a backward domain
27 # name. For example, planetlab.us.arizona.bakers.
29 # PUBLIC_KEY is the public key of the principal identified by the UUID/HRN.
30 # It is a Keypair object as defined in the cert.py module.
32 # It is expected that there is a one-to-one pairing between UUIDs and HRN,
33 # but it is uncertain how this would be inforced or if it needs to be enforced.
35 # These fields are encoded using xmlrpc into the subjectAltName field of the
36 # x509 certificate. Note: Call encode() once the fields have been filled in
37 # to perform this encoding.
40 class GID(Certificate):
45 # Create a new GID object
47 # @param create If true, create the X509 certificate
48 # @param subject If subject!=None, create the X509 cert and set the subject name
49 # @param string If string!=None, load the GID from a string
50 # @param filename If filename!=None, load the GID from a file
52 def __init__(self, create=False, subject=None, string=None, filename=None, uuid=None, hrn=None):
53 Certificate.__init__(self, create, subject, string, filename)
59 def set_uuid(self, uuid):
67 def set_hrn(self, hrn):
76 # Encode the GID fields and package them into the subject-alt-name field
77 # of the X509 certificate. This must be called prior to signing the
78 # certificate. It may only be called once per certificate.
81 dict = {"uuid": self.uuid,
83 str = xmlrpclib.dumps((dict,))
87 # Decode the subject-alt-name field of the X509 certificate into the
88 # fields of the GID. This is automatically called by the various get_*()
89 # functions in this class.
92 data = self.get_data()
94 dict = xmlrpclib.loads(self.get_data())[0][0]
98 self.uuid = dict.get("uuid", None)
99 self.hrn = dict.get("hrn", None)
102 # Dump the credential to stdout.
104 # @param indent specifies a number of spaces to indent the output
105 # @param dump_parents If true, also dump the parents of the GID
107 def dump(self, indent=0, dump_parents=False):
108 print " "*indent, " hrn:", self.get_hrn()
109 print " "*indent, "uuid:", self.get_uuid()
111 if self.parent and dump_parents:
112 print " "*indent, "parent:"
113 self.parent.dump(indent+4)
116 # Verify the chain of authenticity of the GID. First perform the checks
117 # of the certificate class (verifying that each parent signs the child,
118 # etc). In addition, GIDs also confirm that the parent's HRN is a prefix
119 # of the child's HRN.
121 # Verifying these prefixes prevents a rogue authority from signing a GID
122 # for a principal that is not a member of that authority. For example,
123 # planetlab.us.arizona cannot sign a GID for planetlab.us.princeton.foo.
125 def verify_chain(self, trusted_certs = None):
126 # do the normal certificate verification stuff
127 Certificate.verify_chain(self, trusted_certs)
130 # make sure the parent's hrn is a prefix of the child's hrn
131 if not self.get_hrn().startswith(self.parent.get_hrn()):
132 raise GidParentHrn(self.parent.get_subject())